PFAS contamination in U.S. drinking water sparks health concerns

Philadelphia’s tap water complies with federal standards, but a new consumer‑confidence report notes the presence of PFAS, lead and sodium, prompting residents to question water safety. The report references the 2024 federal PFAS rule that sets limits for six PFAS compounds and highlights ongoing regulatory efforts to address chemical mixtures in drinking water.

In Stella, Wisconsin, testing by the state Department of Natural Resources uncovered some of the highest PFAS levels in the nation’s private wells. More than half of the 241 sampled wells tested positive, with 88 exceeding state drinking‑water standards; concentrations of PFOA and PFOS reached over 35,000 parts per trillion. Investigators traced the contamination to historic sludge applications from a paper‑mill operation owned by Ahlstrom Rhinelander LLC, linking PFAS‑treated grease‑proof paper production to the groundwater pollution. Residents face potential health risks, including cancer and thyroid issues, and bear the cost of testing and treatment for their private wells.